Enable multi-touch emulation with -gpu on

This CL implements a callback that gets invoked by OpenGLES emulator on it framebuffer
updates. This allows transferring framebuffer changes to the supporting device.

Proper implementation of this new callback also required changes to JPEG compression,
addressing:

1. OpenGLES framebuffer format is RGBA8889, which required implementing line conversion
   for this format.
2. OpenGLES framebuffer is (or at least could be) bottom-up arranged. This requires changes
   to the compressor, so it compresses the FB starting from the bottom, so the resulting
   image is up-bottom.

Change-Id: Icd4efbe4a251c838adfa3518decbfc43a7ef06c8

1 files changed, 7 insertions, 4 deletions

diff --git a/android/multitouch-port.c b/android/multitouch-port.c
index c8e3ca5..9a9313c 100644
--- a/android/multitouch-port.c
+++ b/android/multitouch-port.c
@@ -409,10 +409,12 @@ static void
 _fb_compress(const AndroidMTSPort* mtsp,
              const MTFrameHeader* fmt,
              const uint8_t* fb,
-             int jpeg_quality)
+             int jpeg_quality,
+             int ydir)
 {
     jpeg_compressor_compress_fb(mtsp->jpeg_compressor, fmt->x, fmt->y, fmt->w,
-                                fmt->h, fmt->bpp, fmt->bpl, fb, jpeg_quality);
+                                fmt->h, fmt->disp_height, fmt->bpp, fmt->bpl,
+                                fb, jpeg_quality, ydir);
 }
 
 int
@@ -420,7 +422,8 @@ mts_port_send_frame(AndroidMTSPort* mtsp,
                     MTFrameHeader* fmt,
                     const uint8_t* fb,
                     async_send_cb cb,
-                    void* cb_opaque)
+                    void* cb_opaque,
+                    int ydir)
 {
     char* query;
     int blob_size, off;
@@ -432,7 +435,7 @@ mts_port_send_frame(AndroidMTSPort* mtsp,
 
     /* Compress framebuffer region. 10% quality seems to be sufficient. */
     fmt->format = MTFB_JPEG;
-    _fb_compress(mtsp, fmt, fb, 10);
+    _fb_compress(mtsp, fmt, fb, 10, ydir);
 
     /* Total size of the blob: header + JPEG image. */
     blob_size = sizeof(MTFrameHeader) +